On Wed, May 26, 2021 at 6:02 AM Sebastian Huber < sebastian.hu...@embedded-brains.de> wrote:
> On 25/05/2021 20:33, Christian Mauderer wrote: > > > >> > >> I thought Sebastian added a "malloc" for the BSP to use before the > >> heap was initialized. But I don't remember the name. Am I remembering > >> correctly? > > > > I don't really know that malloc. But I doubt that it works that early. > > Again: Copying the FDT is one of the first things that these BSPs do. If > > you want to know the exact location: For ARM it's here: > > > > https://git.rtems.org/rtems/tree/bsps/arm/shared/start/start.S#n325 > > > > So it's really basic setup before that. It's interrupt stack, switching > > modes, setup stack pointer and then it's already copy FDT. > > Yes, there is an early "malloc". This is _Memory_Allocate() using > _Memory_Get(). However, for the device tree copy this is not early > enough. We don't know the device tree location provided by the boot > loader. It could be somewhere in the memory area used by the > application. So, it is important to copy this very early into a fixed > location. Also, the device tree may be used to get the size of the > memory provided by _Memory_Get(). > I assume read-only is only from the perspective of higher level language code. Is it possible that being read-only it could be mapped to Flash? For the purposes of minimum size analysis, I will subtract the size of the FDT block from the minimum .text size and if it is still over 64, flag it. --joel > > -- > embedded brains GmbH > Herr Sebastian HUBER > Dornierstr. 4 > 82178 Puchheim > Germany > email: sebastian.hu...@embedded-brains.de > phone: +49-89-18 94 741 - 16 > fax: +49-89-18 94 741 - 08 > > Registergericht: Amtsgericht München > Registernummer: HRB 157899 > Vertretungsberechtigte Geschäftsführer: Peter Rasmussen, Thomas Dörfler > Unsere Datenschutzerklärung finden Sie hier: > https://embedded-brains.de/datenschutzerklaerung/ >
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